/*
 * Copyright 2016 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package io.netty.buffer;

import io.netty.util.internal.PlatformDependent;

import java.nio.ByteBuffer;

class UnpooledUnsafeNoCleanerDirectByteBuf extends UnpooledUnsafeDirectByteBuf {

  UnpooledUnsafeNoCleanerDirectByteBuf(ByteBufAllocator alloc, int initialCapacity,
      int maxCapacity) {
    super(alloc, initialCapacity, maxCapacity);
  }

  @Override
  protected ByteBuffer allocateDirect(int initialCapacity) {
    return PlatformDependent.allocateDirectNoCleaner(initialCapacity);
  }

  ByteBuffer reallocateDirect(ByteBuffer oldBuffer, int initialCapacity) {
    return PlatformDependent.reallocateDirectNoCleaner(oldBuffer, initialCapacity);
  }

  @Override
  protected void freeDirect(ByteBuffer buffer) {
    PlatformDependent.freeDirectNoCleaner(buffer);
  }

  @Override
  public ByteBuf capacity(int newCapacity) {
    checkNewCapacity(newCapacity);

    int oldCapacity = capacity();
    if (newCapacity == oldCapacity) {
      return this;
    }

    ByteBuffer newBuffer = reallocateDirect(buffer, newCapacity);

    if (newCapacity < oldCapacity) {
      if (readerIndex() < newCapacity) {
        if (writerIndex() > newCapacity) {
          writerIndex(newCapacity);
        }
      } else {
        setIndex(newCapacity, newCapacity);
      }
    }
    setByteBuffer(newBuffer, false);
    return this;
  }
}
